A US woman who shot and killed her husband and two adult children before taking her own life is thought to have committed the shocking crime as a result of being ostracised from the religion she was raised in.

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Asylum seeker on 6 week hunger strike

An Iranian man whose application for asylum was rejected has been on a hunger strike since November 1 has already lost 23 kilos and is resolved to "go all the way", his lawyer says.

The 33-year-old from Tehran has been in Australia for four years, and was on community release before the Refugee Review Tribunal determined that he did not qualify as an asylum seeker and should return to Iran, said his lawyer, John Lawrence.

But he said Iran does not accept people who are being involuntarily returned.

"The Department (of Immigration) tried to have him put in hospital under the Mental Health Act ... however the application was considered by psychiatrists and they have refused it because they don't consider that he was suffering from a mental illness, what he's doing of his own free will," Mr Lawrence said.

He said the man is being held in a single cell on 24-hour-watch at Wickham Point detention centre, 40km south of Darwin.

Mr Lawrence said he expected the the authorities would attempt to force-feed the man, which would pose an ethical dilemma for medical staff.

His client seems resolved to "go all the way", he said.

A spokesman for Immigration Minister Scott Morrison would not confirm any of the details of the man's case, citing privacy reasons.

"People who have exhausted all outstanding avenues to remain in Australia and have no lawful basis to remain are expected to depart," he said.

"The department ensures it meets its duty of care to all people in detention and during the course of removal, including provision of health care as necessary."